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22b8ce9470
Way too often, I have a machine that exhibits some kind of crappy behavior. The CPU looks wedged in the kernel or it is spending way too much system time and I wonder what is responsible. I try to run readprofile. But, of course, Ubuntu doesn't enable it by default. Dang! The reason we boot-time enable it is that it takes a big bufffer that we generally can only bootmem alloc. But, does it hurt to at least try and runtime-alloc it? To use: echo 2 > /sys/kernel/profile Then run readprofile like normal. This should fix the compile issue with allmodconfig. I've compile-tested on a bunch more configs now including a few more architectures. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 lines
331 B
Plaintext
14 lines
331 B
Plaintext
What: /sys/kernel/profile
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Date: September 2008
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Contact: Dave Hansen <dave@linux.vnet.ibm.com>
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Description:
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/sys/kernel/profile is the runtime equivalent
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of the boot-time profile= option.
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You can get the same effect running:
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echo 2 > /sys/kernel/profile
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as you would by issuing profile=2 on the boot
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command line.
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